1、 Epidermal difference

There are obvious differences between the two varieties, which can be distinguished from the epidermis first. Iron stick yam has rough surface, obvious pores and pimples, dense hair and whiskers, and purple spots on the surface. The skin of common yam is smooth as a whole, with no obvious pimples in pores, sparse hair whiskers and scattered distribution

2、 Shape difference

In addition to the shape, it can also be distinguished from the shape. Iron stick yam is thin, about 1-1.5cm thick, with different lengths, round head and sharp tail. The common yam is thick, about 4-5cm thick and irregular in shape

3、 Texture difference

Iron stick yam is relatively compact, delicate and fine in texture, with fine fiber. It's very strong and doesn't break easily. But the common yam has a lot of water and is very watery. Usually you can squeeze out water by hand, which is easy to be broken. You should be very careful when taking it

4、 Taste difference

They are also very different in taste, and it is easy to taste the differences. Iron stick yam is steamed or boiled in a pot. It takes only minutes to cook. It tastes dry, sweet and can't be dispersed for a long time. The common yam is crisp even if it is boiled for a longer time, so it is often made into refreshing dishes